package com.sky.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.sky.constant.MessageConstant;
import com.sky.dto.UserLoginDTO;
import com.sky.entity.User;
import com.sky.exception.LoginFailedException;
import com.sky.mapper.UserMapper;
import com.sky.properties.JwtProperties;
import com.sky.properties.WeChatProperties;
import com.sky.service.UserService;
import com.sky.utils.HttpClientUtil;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.time.LocalDateTime;
import java.util.HashMap;

/**
 * @Author: Sabrina
 * @Date:2025/06/10/11:32
 * @Description:
 */
@Service
public class UserServiceImpl implements UserService {

    //微信服务接口地址
    public static final String WX_LOGIN = "http://api.weixin.qq.com/sns/jscode2session";

    @Autowired
    private WeChatProperties weChatProperties;
    @Autowired
    private UserMapper userMapper;

    /**
     * 微信登录
     * @param userLoginDTO
     * @return
     */
    @Transactional
    @Override
    public User wxLogin(UserLoginDTO userLoginDTO) {
        String code = userLoginDTO.getCode();
        //1.code非空判断
        if (code == null){
            throw new LoginFailedException(MessageConstant.LOGIN_FAILED);
        }

        //2.获取openid
        String openId = getOpenId(code);

        //3.openid非空判断
        if (openId == null){
            throw new LoginFailedException(MessageConstant.LOGIN_FAILED);
        }

        //4.判断当前用户是否为新用户
        User user = userMapper.isIdExists(openId);

        //(5.如果是新用户,自动完成注册)
        if (user == null){
            user = User.builder().openid(openId).createTime(LocalDateTime.now()).build();
            userMapper.insert(user);
        }

        //6.返回user对象
        return user;
    }

    /**
     * 组装参数,code,小程序id,小程序密钥 --> 调用微信第三方登录接口获取openid
     * @param code
     * @return
     */
    private String getOpenId(String code) {//微信授权码code

        HashMap<String, String> map = new HashMap<>();

        map.put("appid", weChatProperties.getAppid());//小程序id
        map.put("secret", weChatProperties.getSecret());//小程序密钥
        map.put("js_code", code);
        map.put("grant_type","authorizaiton_code");

        String jsonResult = HttpClientUtil.doGet(WX_LOGIN, map);
        JSONObject jsonObject = JSON.parseObject(jsonResult);
        String openid = jsonObject.getString("openid");
        return openid;
    }
}
